Kolasib district is one of the eight districts of Mizoram state in India. body The district is bounded on the north and northwest by Hailakandi district of Assam state, on the west by Mamit district, on the south and east by Aizawl district and on the northeast by Cachar district of Assam state. The district occupies an area of 1382.51 km2. Kolasib town is the administrative headquarters of the district.

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